Darkness of two-mode squeezed light in Λ-type atomic system. (14th January 2020)

• Record Type: Journal Article
• Authors: Moiseev, E S; Tashchilina, Arina; Moiseev, S A; Lvovsky, A I
• Is Part Of: New journal of physics. Volume 22:Number 1(2020:Jan.)
• Publication Date: 2020-01-14
• Subjects: dark state -- squeezed light -- entanglement -- four-wave mixing -- off-resonant light-atom interaction; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ab5fac
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We show that, under certain circumstances, an optical field in a two-mode squeezed vacuum (TMSV) state can propagate through a lossy atomic medium without degradation or evolution. Moreover, the losses give rise to that state when a different state is initially injected into the medium. Such a situation emerges in a Λ-type atomic system, in which both optical transitions are driven by strong laser fields that are two-photon resonant with the respective signal modes. Then the interactions of the two signal modes with the ground-state atomic coherence interfere destructively, thereby ensuring the preservation of the TMSV with a particular squeezing parameter. This mechanism permits unified interpretation of recent experimental results and predicts new phenomena.